A portable patient lift has spreadable support legs with a feature that enables the legs of the lift to operate in a first range of motion during operation, and a second range of motion for compact folding.
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1. A lift portable patient comprising:
a base,
a mast extending from the base,
a boom extending from the mast, the boom being structured to support a cradle for lifting a patient,
support legs extending from the base,
a mechanical controller operatively connected to the legs to move the legs throughout a first range of motion between a first spread apart position and a second spread apart position, the mechanical controller having an anti-back drive including a movable member and a fixed member, the movable member pivotally supporting a pin that is selectively engageable with one of a plurality of slots in the fixed member to prevent inadvertent movement of the legs,
a disengagement feature operative to disengage the legs from the anti-back drive so as to enable movement of the legs throughout a second range of motion between the second spread apart position and a substantially closed together position, the disengagement feature comprising a slideable shaft supporting a link, the mechanical controller comprising a leg rotation member supported in relation to the slideable shaft, the slideable shaft being operable in a first position, wherein the link engages the leg rotation member to permit the operation of the support legs via the first range of motion, and a second position, wherein the link disengages the leg rotation member to permit the operation of the legs via the second range of motion, the lift being foldable into a compact form for ease of transportation and storage by folding the boom in relation to the mast so that the boom is folded toward the mast and folding the mast in relation to the base so that the mast is folded toward the legs.
10. A lift portable patient comprising:
a base,
support legs extending from the base,
a mast extending from the base,
a boom extending from the mast, the boom being structured to support a cradle for lifting a patient,
a mechanical controller operatively connected to the legs to move the legs throughout a first range of motion between a first spread apart position and a second spread apart position, the mechanical controller having an anti-back drive to prevent inadvertent movement of the legs, and
a disengagement feature operative to disengage the legs from the anti-back drive so as to enable movement of the legs throughout a second range of motion between the second spread apart position and a substantially closed together position,
wherein the mechanical controller comprises a leg rotation member and the disengagement feature comprises a slideable shaft supporting the leg rotation member for rotational movement in relation to the base and a link supported in fixed relation to the shaft, the link being engageable with the leg rotation member, the legs being pivotally connected to the base and operatively connected to the link by tie rods, the mechanical controller being operatively connected to a foot pedal that is displaceable to effect movement of the leg rotation member, which in turn effects movement of the link and the tie rods to cause the legs to move about a pivot axis throughout the first range of motion, the slideable shaft being axially displaceable to disengage the link from the leg rotation member to in turn disengage the legs from the mechanical controller to permit the legs to move about the pivot axis throughout the second range of motion, and
wherein the lift is foldable into a compact form for ease of transportation and storage by folding the boom in relation to the mast so that the boom is folded toward the mast and folding the mast in relation to the base so that the mast is folded toward the legs.
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This invention relates in general to hoisting equipment and more particularly, to a portable lifting apparatus for lifting and transferring incapacitated persons.
Lifting devices are well known. Such devices typically include a base, a mast extending upwardly from the base, and a boom extending forwardly from the mast. The boom generally supports a carriage by which the patient can be completely suspended from the lifting device. Rollers depending from the base enable the device and thus the patient to be transferred.
Size (i.e., length and width) of a lifting device contributes to the stability (or instability) of the device and its ability to be easily navigated. The ability of the lift device to be folded into a compact form contributes to its ease of transportation and storage. It is well known to provide lift devices with legs that open and close by operation of a foot pedal. Prior art lifts have legs that operate to open and close over a single range of motion. There is no definitive differentiation between the motion of the legs when the legs are moved to an opened position (i.e., during operation of the lift) and when the legs are moved to the closed position (i.e., during transportation and storage of the lift). If the legs are not sufficiently opened during operation of the lift, the stability of the lift may be affected and the patient's safety may be compromised. If the legs do not close sufficiently, then ease in transportation and storage of the lifting device may be affected.
A portable patient lift is needed with spreadable support legs having a feature that enables the legs to be sufficiently opened during operation of the lift and sufficiently closed into a compact form for transportation and storage.
The present invention is directed towards a portable patient lift that has spreadable support legs with a feature that enables the legs of the lift to operate in a first range of motion during operation, and a second range of motion for compact folding.
Various objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
Referring now to the drawings, there is illustrated in
During operation, the support legs 14 can be spread open and closed, as shown in
The illustrated base 12 is generally H-shaped, having left and right blocks 26, 28 oriented in a forward/rearward direction, and having a central connecting body or rib 30 extending laterally between the left and right blocks 26, 28. Each block 26, 28 has a rearward end 26a, 28a from which caster wheels 31 are mounted for rotation. A forward end 26b, 28b of the blocks 26, 28 provides a mounting point for the support legs 14, wherein the support legs 14 may be rotatable on a vertical axis A (shown in
As illustrated in
In operation, the legs 14 operate in a first range of motion during operation, and a second range of motion for compact folding. The legs 14 preferably operate in unison so that when one leg 14 spreads open, the other spreads open as well. As illustrated in
A mechanical controller 36, as shown in
As shown in the drawings, the front end of the leg rotation member 42 is supported by a slideable shaft 52 that extends through a front-mounting block 53 and further through the front end of the rib 30. The slideable shaft 52 is supported for rotation relative to the front-mounting block 53, such as via the bushing 54 shown. The front-mounting block 53 is held in fixed relation to the front end of the rib 30, for example, by threaded fasteners 55. The slideable shaft 52 extends into the leg rotation member 42. Attached to a portion of the shaft 52, exposed through the front end of the rib 30, is a knob 56. The slideable shaft 52 is operable in a first position, wherein a link 52a supported by the slideable shaft 52 engages the leg rotation member 42 to permit the operation of the support legs 14 via the first range of motion, wherein the legs 14 are selectively movable to the first leg position shown in
As clearly shown in the drawings, the link 52a has opposing ends pivotally connected to opposing tie rods 66, to which the legs 14 are pivotally coupled, such as, for example, via the shoulder bolts 67 shown. The link 52a has an irregular shape and is adapted to engage an irregular shaped opening or channel 42a (shown in
The mechanical controller 36 shown includes left and right leg rotation plates 68 and 70 that are supported for sliding movement relative to the foot pedal 24 by leg rotation plate pins 72. The leg rotation plate pins 72 are fixed relative to the foot pedal 24 and displaceable in slots 68a, 70a in the leg rotation plates 68, 70. An outboard movable plate 74 is held in a fixed position relative to the inboard movable plate 38 by pins 76. The leg rotation plates 68, 70 are pivotally supported relative to the outboard movable plate 74 by pivot pins 78. The inboard and outboard movable plates 38 and 74 house the foot pedal 24 and the leg rotation plates 68, 70 therebetween.
In operation, the engagement pin 38a is located in a slot 40a in the fixed plate 40. Upon depressing the foot pedal 24 (i.e., in a counter-clockwise direction when viewing
The principle and mode of operation of this invention have been explained and illustrated in its preferred embodiment. However, it must be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing from its spirit or scope.
Bain, Colin C., Heales, Nigel, Genske, David
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